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习题练习：Physics Unit12: Sound
本习题练习来源于51fly国际课程 (https://51fly.win)，是在线习题练习的打印版，您也可以访问本平台网站(https://51fly.win/)直接在线完成(注册并登录账号后在首页左侧输入试卷号 70 即可在线作答)，，作答电子化后可随时回放，查看每题答案与详细解析，搜藏保存任意题目；教师使用本平台可以抽题组卷或一键复制他人试卷，布置为在线考试或在线作业，全自动判分成绩一键排序导出，省时省力。本试卷的直接作答链接 https://51fly.win/test70.html
 作者: physics  发布日期: 2022-09-26 09:56    总分: 87分  得分: _____________

答题人: 匿名未登录  开始时间: 22年08月07日 09:59  切换到: 整卷模式

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following is a falserq2am)tbq +l8 statement?

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In general, sound is conducted fastest th1x24s c1.nm iiucmnw.rough

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the speed of soujnef7xgkh*h4 fr)ht 3p z:( f*g3c1nhnd in a steel rod?

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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the temperature of the air increases, wherdh rw66xh/ omw (1fu4 o:,ecat happens to the velocity of sound? (Assume that all other factors remaiwou6e/d(4 w6 ,1mx chehrfro:n constant.)

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Compared to the velocity of a 400 Hz sound, the velocity of a 200 Hz l,rlncj*4s8hba 91d*n hg gl, sound through ai ngn lr*,84l9lsgadbj *,hch 1r is

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6#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Compared to the wavelength of a 400 Hz sound, the wavelength6: quc7bi )3, ftx1a. n t)beptxbio2h of a 200 Hz sound in aiho1 :)),72x cpqit. bxet6nt auf3 bibr is

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Sound vibrations with frequencies greater than 20,000 Hz are calledlj;3mafz l*s ,(,et oa

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Sound vibrations with fmn/fzlnr-y(80b x2nkx49hya requency less than 20 Hz are called

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that a sound source is emitting waves uniformly in all :/2 znefe-hmzdirections. If you move to a point twice as far away from the source, the frequency of the sound wi e:- e/2hnmzzfll be

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  For spherically diverging waves, intq*ovpl4z4bc nt:5 1 tvensity is proportional to

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The intensity of a point source at a distance d from the source is I. What is t gc**r1k:el(y3nuzb jhe intensity at a distance 2rb1zue3 g*:yl(* cj nkd from the source?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You double your distance from a sov7/t 2kq4gg sdv t*q9gu ff3yl14bf ;eund source that is radiating equally in all directions. What happens to the intensity of the g*lk4q d 3t2vbvfg;7qyeuft /g4fs 19sound? It reduces to

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You double your distance from a sound source thg- yu,vra9 ave2 a3gb/at is radiating equally in all directions. What happens to the intensity level of the sound? It vrgg-/ya u2vea9a b3,drops by

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following increases as a sound bewm4lf2k7fk vje c 0.t.comes louder?

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You move slowly toward a speaker emitting a pure tone. s o:;dq4)xv zrWhat characteristic of the souv)4zxs :qd;or nd increases?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What determines "loudness" of a musoq1w4rwe/lpul;4u z 1ical note?

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17#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What determines the "pitch" of a 8 i2dc/n*)pqi u;.l p5lavivjmusical note?

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18#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  When sound passes froo98 z4(qodmfzm air into water

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Pressure and displacement waveyewf g**u3 oq7s are

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20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider the standing wave on a guitar string ern*(mi-8w/ ph(z ym zand the sound wave generated by the guitar as a (wm8-/e ziz r(nhy* pmresult of this vibration. What do these two waves have in common?

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a resonating pipe which is open at1fzz4 j .3d uj+jzb0kl both ends, there

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an open pipe of length L. What are ta gp2;l(ran 80-bi 1fgqr4gqthe wavelengths of the three lowest tones produced rgt lr p ngqg40aaq-b;i 8(2f1by this pipe?

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23#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The lowest tone to resonate in an open pipe of length L is 9a tp7c+r) vm7paf,jm8mx9a w200 Hz. Which one of the following frw+mm7cv8a)jmfa 9 ,pt7xa9rpequencies will not resonate in the same pipe?

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An open pipe of length L is 4kb1d;; szplwjy ag5-resonating at its fundamental frequency. Which statement asj5k4 ;;dlgzyp1-bw is correct?

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25#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a resonating pipe which is 3dv 8e47w;3:jneguskvzfzv9p c) 2g popen at one end and closed at the other, there

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26#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider a closed pipe of length L. What are the wavelengths of the th4aml0c ni*i8 yree lowest tones produce80nac lmy*ii 4d by this pipe?

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The lowest tone to resona,-w9+h ,*uolrxh aj46i dn uttte in a closed pipe of length L is 200 Hz. Which of the followin+6j o4*n9,ur,t a -idulwhth xg frequencies will not resonate in that pipe?

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pipe of length L closed at one end is resonating at its fundam qyt:q 3gmb40l9xk b0izd6 ,lvental frequency. Which st 04q3l:zb,i mv0qtdl69k b yxgatement is correct?

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A person stands between two speakers driven by the same source. yj xkv6puwuub6o i169 l43 1tf Each speaker produces a tone with a frequency of 2004l61uxf6yo it b163kv9p uwju Hz on a day when the speed of sound is 330 m/s. The person is
1.65 m from one speaker and 4.95 m from the other. What type of interference does the person sense?

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30#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In order to produce beats, the two sound waves should ham k+l5ij,,(zjj n vb*pve

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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Two pure tones are sss:bbf1a -d z1nh)l3dounded together and a particular beat frequency is heard. What happens to the beat frequency if the frequency of one of the d:dazsf ls)3n11 - hbbtones is increased?

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The Doppler shift explaigg sffa+ 656qlns

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A sound source approaches a stationary obseqsl ul w-/5pudv , rvfd0t,s,0rver. The frequency heard by the observer issw l 0 dt/,upr,fql0v,5 dsu-v

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A sound source departs from a stationawf6z*n3pvm3( l; gduv.vg 3 xkry observer. The frequency heard by the observer is zv3v lkufn.;(wgm363dvgp *x

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a jet plane were to double its MACH-speed, its 9h pg dkh7j /avf75vo/half-angle will decrease by a factor of: g/jdkv9h5/hvo7f a7p

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The speed of an ultrasonic sound of frequency 45 kHz in air is 352 m/s. Whtk6j2dtc cad-m o*ayh:q 1c/; at is the air temp oy*d6kj m 2;/1dctc-qatca: herature?

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the ratio of thyvar0y.u /i/li(n q ;ge speed of sound in air at $0 \; ^{\circ}C$ to the speed at $100 \; ^{\circ}C$?

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  On a day when the speed of sound in air is 340 m/d5- v yzpc fsd dx+4hgtv(s138s, a bat emits a shriek whose echo reaches it 0.0250 s later. How far away was the object t83ht+sgc4 d(-vdxsdp z y 15fvhat reflected back the sound?

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You shout at a cliff, and hear the echo in 4.00 s.xe4xe c ; da/6gge+o.h The temperature is $0 \; ^{\circ}C$. How far away is the cliff?

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If you hear thunder 5.0 s after seejs*e4 m49mvpgl0 *os yp(lc.ting a flash of lightning, the distance to the lightning strike is abo s*eg s*jppvtlmy(m4c49 .0lout

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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An echo is heard 2.0 s from a v;/id0alu9x3y8 moqnp u rf.0cliff on a day the temperature is $15 \; ^{\circ}C$. Approximately how far is the cliff from the observer?

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  On a $30 \; ^{\circ}C$ day, there is an explosion. The sound is heard 3.4 s after seeing the flash. How far away was the explosion?

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You drop a stone into a r ;sw4xqoa qs9:vp1+hdeep well and hear the splash 2.5 s later. How deep is the well? (Ignore air resistance, and assuv+r1apo ;sqsw4 9:hxq me the velocity of sound is 340 m/s.)

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The wavelength in air of a sound wave om df:tjt24x j*kx3mqa )t;r g9f frequency 500 Hz is

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Sound traveling in air atd +sjvhz:do:x /eg7i . $23 \; ^{\circ}C$ enters a cold front where the air temperature is $2 \; ^{\circ}C$. If the sound frequency is 1500 Hz, determine the wavelength in the warmer air and in the colder air.

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the intensity level of a sound with intensig vy3 dy3su 3 s(+v5-hgnys:aity $10^{-3} \; W/m^{2}$?

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the intensity of a 70-* pg0w(d j8ew qfc1 1:p5 vg,foivwl.gdB sound?

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the ratio of the intensities of two sounds with intensity 5okqm 8, f;5 ejrbb:lylevels of 70 dB and 40 df 5jkbr:y; bql,8oe5mB?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The intensity level by 15 enginesm+odrh9 ,spnl6r i (6a in a garage is 100 dB. What is the intensity level generated by one e9,(dp6osnai mh6r+ lr ngine?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The intensity at a distance of 6.0 m from a source rk.6(1+ otq.kfi:mzfl1w cvfthat is radiating equally in all directions isfw11 .kz:+ m fk 6lqfr.vt(oic
$6.0 \times 10^{-10} \; W/m^{2}$. What is the power emitted by the source?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The intensity at a distance of 6.0 m fro80j ejm/:ih ;wwyvds0m a source that is radiating equally in all dirmjsey;vi:j8h /w0 0dwections is
$6.0 \times 10^{-10} \; W/m^{2}$. What is the intensity level in dB?

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A barking dog delivers about 1 mW of power, which is assumeegq )es nlnb3lo0.+ 5b:0/klx wsr,aed to be uniformly distributed in all directions. What is the intensity level at a distance 553b.eo lkgbn arq+ l wl):sn,e x0se/0.00 m from the dog?

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The intensity level is 65 dB at a distance 5.00 m frolw md wg:;ykug /2tn1;m a barking dog. What would be the intensity levetm/ uwwkn g: y;2d;l1gl if two identical dogs very close to each other are barking?

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54#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At a distance of 15 m from a sound source the inteesx4l p 0w73 41(vex6bfyeafw nsity level is 60 dB. What is the intensity level (in dBv43 7x ee14 e6p0yflwafswx(b ) at a point 2.0 m from the source? Assume that the source radiates equally in all directions.

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The sound intensity level 5.0 m (t g+a f+8dkk5) f.c0voemd glcqf1)v)5jymd from a point source is 95 dB. At what distance will it be 75 dB? fd5akjv)y1 kv0fl)me5d.8)(mq+ tgod+gfcc

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The third harmonic of a complex tone has a frequency of 1200 Ha1wtfi ow03 :gz. What is the freq03awow: tg i1fuency of the fourth harmonic?

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The frequency of the third harmonic yrm30de * p)rmof an open pipe is 900 Hz. What is the length of the pipe0ym )e 3rrmp*d?

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The lowest tone to resonate in an open pipe of ,vli8- pwt)xws )sfp5 b1iz3jlength L is 400 Hz. What is the frequency of thep)13bws)vw8x pjz i- lsft5 i, lowest tone that will resonate in an open pipe of length 2L?

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59#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An organ pipe open at both ends has avj3 dm fog+5ywr g8e)fl8lx0v;.igl: length of 0.80 m. If the velocity of sound in air is 340 lr)xjg vy3 8glm 8g+fv: fe;5l.ow0idm/s, what is the frequency of the second harmonic?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 3.00-m long pipe is rv nwyckrjfh: y55oyrzldau3;9)0q2hk l+,:in a room where the temperature is $20 \; ^{\circ}C$. What is the fundamental
frequency if the pipe is open at both ends?

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The fundamental frequencd c ygq z8:/imlo6hr +6*6xeioy in a pipe closed at one end is 330 Hz. What is the fre6i8+/ r6yzi qdg:lmceh *6oxoquency of the third harmonic?

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62#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the length of the shortest pipe closed mtcc+( /v6*snqe,ooq on one end that will have a fundamental frequency of 60 Hz on a day when the velocity of sound is 340 m/s*6cm /qn+vo,es ( cotq?

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63#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 3.00-m long pipe is in a rf8ehh ab )w/m4oom where the temperature is $20 \; ^{\circ}C$. What is the fundamental frequency if the pipe is closed at one end?

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 3.00-m long pipe is in a room gl3/z -8, yk tck1+pzbges+xdh.-xvp where the temperature is $20 \; ^{\circ}C$. What is the frequency of the second harmonic if the pipe is closed at one end?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A closed organ pipe of l va.7z +01up siehgmemm;-b; nength 0.75 m is played when the speed of sound in air is 340 m/s. What is the fundamenta ;+mep0 m;7hu1- i mv.szaebgnl frequency?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider two pipes of the same length: one is open and the other is closed onon:y4 r6h(7v*hftdo8c asyh 8 one end. If the fundamental frequency of the open pipe is 300 Hz, what is thety6cn7yaf8h : r8* dhso hv4(o fundamental frequency of the closed pipe?

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Two adjacent sources eachpveulj y v0ri0652-u6au kf; a emit a frequency of 800 Hz in air where the velocity of sound is 340 m/s. How much farther back would source 1 have to be moved so an obsvviu-a e f0uajr05 2k u6yl6;perver in front of the sources would hear no sound?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Two speakers are placed side by side and driven by th3rmt4 1*brxa ,kcyl(wl+qi b+ e same frequency of 500 Hz. If the distance from a person t mb qwbyt,+3+1 c(k4xrll*irao one speaker is 5.00 m and the person detects little or no sound, which of the following is a possible the distance from the person to the other speaker? (The sound speed is 340 m/s.)

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Two tunes have frequencies of 440 Hz and 444 Hz. What is the beat frequencyn4 mqur* w4 /9 04we*;ckkxjutgxk f,kclk62j?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A music tuner uses a 550-Hz tunctlgbtn3e .*k79yk: pbg;h9 hoj) ns1ing fork to tune the frequency of a musical instrument. If the tuner hears a beat frequency of 2 Hz, what is the frequency n b g lb9oh7 :gehpt9*kt1 )ky.scn;3jof the instrument?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The wavelengths of the sounds produced by two hornsm5 mvb37xg 9/7tg4 9dcovdup e (nu8iy are 6 m and 7 m respectively. What beat 7gb97d ovc/gm(y58 umdi4tne93 xuv pfrequency is heard when the horns are sounded on a day when the velocity of sound is 340 m/s?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The corresponding violin stringwa 0 s.o:zg/mged 355d5nmsw6 dms1yh s on two violins in an orchestra are found to produce a beat frequency of 2 Hz when a frequency of 660 Hz is played. What percentage change in the tension of one of the strings would bring them to the same frequenc:5dm6nz 0w esh/.sd5do a3msgwg1my 5y?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An observer approaches a 4zha y9+kjo ff8ed-j swf 0/q2stationary 1000-Hz sound source at twice the speed of sou 0zj- 9 yfasf8+/qewfd24 hkjond. The observer hears a frequency of

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A sound source (normal frequency of 100 a2 fxhc.7,wlxmkre7,0 Hz) approaches a stationary observer at one-half the speed of sound. The observe7harf,2w lcmxek7.x ,r hears a frequency of

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A sound has a frequency of 1000 Hz. If a listener moves with a speed of 3 7j6/g lbi9jv ;bdraf2xown4+0 m/s away from the source, what is the frequency heard by the observer? (The sound speedi j r b2gwf9lx oa+76jdb/vn4; is 340 m/s.)

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A police car has an 800-H-v p(x1kqx :ltkwc1 o2xn) x.xz siren. It is traveling at 35 m/s on a day when the speed of sound through air is 340 m/s. The car approaches and passes an observer who is standing along the roadside. What ck:nq) x2wolx ( pkv1x x-1.txchange of frequency does the observer hear?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the frequency heard by a stationary obl meukwl 2.aeq/ zc + ko24,+*uk7rurbserver when a train approaches with a speed of 30 m/s. The frequencyr*7qelacm, 2/euz+k r wo +uk b2ku4.l of the train horn is 600 Hz and the speed of sound is 340 m/s.

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A train is traveling i.-nt0j*tcjy nh.t4 y toward you at 120 km/h. The train blows its 400-Hz whistle. Take the speed of sound to be 340 mny. nj0ct- .*ijyt h4t/s. What frequency do you hear?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are moving at 120 km/h toward;izo (.i-w6khbscgi :bv76ou 5 f ne4z a stationary train. The train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. Wh(z .;i5o wveczbgb6:n7f uk-hsiio4 6 at frequency do you hear?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A train is traveling f 0r.w5azq; dcaway from you at 120 km/h. The train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. ;w fr.zq0dc5aWhat frequency do you hear?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A train is traveling away from you at 120 km/h. It f/wfkks ch/4 )gyp5d; blows its whistle, and you hear a tone of 400 Hz. Take the speed of sound to be 340 m/pk s; )dc/fk/y4wfh5 gs. What is the actual frequency of the whistle?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The frequency of a train horn is 500 Hz. a/t 8g7;7 yggfb4ogqa cslm;+ Assume the speed of sound in air is 340 m/s. What is the frequency cst8fggag /77gy+o;qm4 l; abheard by an observer if the observer is moving away from the train with a speed of 30.0 m/s?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The frequency of a train horn is 500 Hz. Assume the speed of sound in air is(oxgffl3fy +*n9c i9 g 340 m/s. What is the frequency heard by an observer if the observer is approaching the train withiy g9(g 9xo+clf*f3nf a speed of 30.0 m/s?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Sonar is used to determine the speed of an object. A 40-kHz signal isy*mo bm o4paa:3z+5gr sent out, and a 42-kHz signyag:*p5 a+o 43omrzmbal is returned. Assume the speed of sound is 345 m/s. How fast is the object moving?

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The half angle of the conical shock wave produced by a supexpn1/7qq0w;r oob r 6trsonic aircraft is $60^{\circ}$. What is the Mach number of the aircraft?

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A jet flies at a speed of Mach 1.4. What is the l6:zpo qac8 mwp(c*.ohalf-angle of the conical shock ca*moloq(c6p :zw .p8 wave formed?

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The Concord airplane flies from the United States to Europe with a /ajvn* f5d5 iuemxs+ ejhfg5oz*3 5(q Mach number of 1.05 where t5/qjefxvs*ou5+ ej*i 5hn(3 dg5zm fahe air temperature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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